Exhibit 23.1
  Consent
    of Independent Registered Public Accounting Firm
    (1)
    Registration Statement
    (Form S-8
    No. 33-54394)
    pertaining to the Input/Output, Inc. Amended 1990 Stock Option
    Plan and Amended and Restated 1991 Outside Directors Stock
    Option Plan,(2)
    Registration Statement
    (Form S-8
    No. 33-46386)
    pertaining to the Input/Output, Inc. 1990 Restricted Stock Plan,
    1990 Stock Option Plan and 1991 Directors Stock
    Option Plan,(3)
    Registration Statement
    (Form S-8
    No. 33-85304)
    pertaining to the Input/Output, Inc. Amended 1990 Stock Option
    Plan and the Input/Output, Inc. Amended and Restated 1991
    Outside Directors Stock Option Plan,(4)
    Registration Statement
    (Form S-8
    No. 333-14231)
    pertaining to the Input/Output, Inc. 1996 Non-Employee Director
    Stock Option Plan,(5)
    Registration Statement
    (Form S-8
    No. 333-24125)
    pertaining to the Input/Output, Inc. Employee Stock Purchase
    Plan,(6)
    Registration Statement
    (Form S-8
    No. 333-80297)
    pertaining to the Input/Output, Inc. 1998 Restricted Stock Plan,(7)
    Registration Statement
    (Form S-8
    No. 333-80299)
    pertaining to the Input/Output, Inc. Amended and Restated 1990
    Stock Option Plan and the Input/Output, Inc. Amended and
    Restated 1996 Non-Employee Director Stock Option Plan,(8)
    Registration Statement
    (Form S-8
    No. 333-36264)
    pertaining to the Input/Output, Inc. 2000 Restricted Stock Plan,(9)
    Registration Statement
    (Form S-8
    No. 333-49382)
    pertaining to the Input/Output, Inc. 2000 Long-Term Incentive
    Plan,  (10)
    Registration Statement
    (Form S-8
    No. 333-60950)
    pertaining to the Input/Output, Inc. Non-Employee
    Directors Retainer Plan,(11)
    Registration Statement
    (Form S-8
    No. 333-112677)
    pertaining to the Input/Output, Inc. 2003 Employee Stock Option
    Plan,(12)
    Registration Statement
    (Form S-8
    No. 333-116355)
    pertaining to the GX Technology Corporation Employee Stock
    Option Plan,(13)
    Registration Statement
    (Form S-8
    No. 333-117716)
    pertaining to the Input/Output, Inc. Concept Systems Employment
    Inducement Stock Option Program,(14)
    Registration Statement
    (Form S-8
    No. 333-123831)
    pertaining to the Input/Output, Inc. GX Technology Corp.
    Employment Inducement Stock Option Program and the Input/Output,
    Inc. April 2005 Inducement Equity Program,(15)
    Registration Statement
    (Form S-8
    No. 333-125655)
    pertaining to the Input/Output, Inc. 2004 Long-Term Incentive
    Plan,(16)
    Registration Statement
    (Form S-8
    No. 333-135775)
    pertaining to the Input/Output, Inc. Second Amended and Restated
    Input/Output, Inc. 2004 Long-Term Incentive Plan,(17)
    Registration Statement
    (Form S-3
    No. 333-112263)
    of Input/Output, Inc.,(18)
    Registration Statement
    (Form S-3
    No. 333-115345)
    of Input/Output, Inc.,(19)
    Registration Statement
    (Form S-3
    No. 333-123632)
    of Input/Output, Inc.,




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(20)
    Registration Statement
    (Form S-8
    No. 333-145274)
    pertaining to the Third Amended and Restated Input/Output, Inc.
    2004 Long-Term Incentive Plan, and(21)
    Registration Statement
    (Form S-3
    No. 333-148235)
    of ION Geophysical Corporation,(22)
    Registration Statement
    (Form S-3
    No. 333-149458)
    of ION Geophysical Corporation,(23)
    Registration Statement
    (Form S-8
    No. 333-155378)
    pertaining to the Fourth Amended and Restated 2004 Long-Term
    Incentive Plan and the ARAM Systems Employee Inducement Stop
    Options Program,(24)
    Registration Statement
    (Form S-3
    No. 333-155387)
    of ION Geophysical Corporation,(25)
    Registration Statement
    (Form S-3
    No. 333-156362)
    of ION Geophysical Corporation,(26)
    Registration Statement
    (Form S-3
    No. 333-156363)
    of ION Geophysical Corporation,(27)
    Registration Statement
    (Form S-3
    No. 333-159898)
    of ION Geophysical Corporation,(28)
    Registration Statement
    (Form S-8
    No. 333-167943)
    pertaining to the Fifth Amended and Restated 2004 Long-Term
    Incentive Plan and the ION Geophysical Corporation Employee
    Stock Purchase Plan, and(29)
    Registration Statement
    (Form S-3
    No. 333-166200)
    of ION Geophysical Corporation,  (Form 10-K)